Contamination path seems via R4408. Complete removal of both R (plus any other components connecting this trace to the remaining circuit) didn't stop buzz though - we think RF is coupled to a nearby trace or component near trace end on R4408 inside can, near Wolfson. So probably when removing doesn't help, replacing with a ferrite bead won't either. But we never tested it. If you're keen to do it, your report on it is highly appreciated, no matter whether positive or negative result.
/jOERG Am Mo 13. Oktober 2008 schrieb Laurie Bradshaw: > Hi, I've also been suffering with this buzz problem, and have been > wondering if replacing R4401 with a suitable 220R smd ferrite might > achieve the desired result whilst hopefully being at least a little > easier than trying to retrofit a ferrite bead to JK4401. > > 2008/10/13 Joerg Reisenweber <[EMAIL PROTECTED]>: > > Am Mo 13. Oktober 2008 schrieb [EMAIL PROTECTED]: > >> Sorry about the dumb question. I was just wondering if bluetooth headsets > > would be affected by this buzz problem. > > > > No. Will work without buzz > > /jOERG > > > > _______________________________________________ > > hardware mailing list > > [email protected] > > http://lists.openmoko.org/mailman/listinfo/hardware > > > > >
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